Method of hydraulically controlling apparatus.



G. e. EARL. A METHODOF HYDRAULICALLY CONTROLLING APPARATUS.

APPLICATION FILED NOV. II, X912.

1,1"?4,24;3, Patented Mar. 7, 19m.

- ammto'a v ename: GdbD'ELL EAR strATE-sPAT NT OFFICE A L, or NEw ydRLnANs, LOUISIANA.

I 1 y METHOD or" HYDRAULICALLY CONTROLLING APPARATUS.

Specification of Letters Patent.

Patented Mar. 7, 1916.

, original application filed January 3,1910, Sria1No. 536,239. Divided and this application filed November To all whom it mag qconcefn," a

Be ,i tfknown that I, GEORGE GQ-EARL, a (in of theuUnitedl States, residing at orleansrgintlie pa'rishof Orleans and S State of 1 Louisiana, have invented certain ne and; useful Improvements in the Method Q of; Hydraulically Controlling Apparatus;

I dofhereby declare the following to be *vrew 5y ling 'or actuating an independent mechay useful; purposes in f controlling the nt of? a substance can be accomatica-llya creating and'f nai-ntaining a which willffalways .be propornon-al en functional to another head, level pressure, or tofthe difference between two or. more hea'dsg'llevels or pressures, one or more of which maybevarying.

In theadevicesfhe n- :sures, fordiffere of pressures, which sgthe heads ontwosides of an orifice. It; obvious, however. that the difference between any two-other eads levels or pres i which also yarie. nctionally ,with a flof'h in a conduit, acility with this d evice.

m of apparatus in l a isemployed; I

' ll ig'ure '1 of the draw igs is a diagram matic view of an apparatus embodying my im'ention, said apparatus being used for I automatically controlling the sup 'ily of a chemical solution; to water which ,itds desired t ofltreat with saidsolution. Fig; 2 is audetailf vertical sectional View ofthe bal- U ang ed pilot-valvethat controls the fluid 'Fig. 3

employed in automatically" control-.

siich, for example i as a recording or 1 ind cating device or a yal've or set'ofo alyes. for goiterning. the head 01f the level of )ile of the fundamental prihciples of this ntion consists in my 7 d scovery that ed-by an-apparatu' or device capable of r, on or against a 'nafter illustrated, the

' I i have beenlshown utilization are, in some" could bensed wi tl'iapplication is a division offiiiy ap-' objects oli'm'y nvehtioiij and 'tillustratcd from -e process or method.

preferably arrangedin such a manner the V proxili'iately level withthe lower edge Ofllll 91.1,1912. Serial o. 730,671.

which actuates the hydraulic valve are i ranged in the chemical solution supply pipe.

is a detail vertical sectional View a of the balanced pilot valve that controls admission and egress of Water to and from the receptacle in which one of the weigh is arranged. i

Referringwto Fig. 1 of the drawings, 1 designates the 'top' and bottom walls of a conduit through which water flows, and 2 5 designates a vertically disposed partition that separates saidconduit into'two compartments A and B, said partition being provided with an orifice 3 that permits the water to flow from the compartment A into the compartment '13, as indicated by the arm- The object of this apparatus is to ontrol the introduction of a chemical solu- ",tion into the water in theco'mpartment B and cause the flow of said chemical solution to vary automatically as the flow of; water into said compartment varies ,The chemical solution is contained in a suitable tank, not shown, and is conducted from saidtank by means of a pipe at to a tank 5 having an orifice 6 that permits the chemicalisolution to escape from said tank through a pipe? into the compartment B, a hydraulic valve C being arranged in the pipe 4 for controlling-the flow of the chemical solution'to' the tank 5. \Vhile I have herein shown a hydraulic valve C for controlling the supply of chemical solution to the water conduit, it will, of course, be obvious that any other suitable type of valve couldbe 9Q used forithis purpose and therefore, I do not wish it to be understood that my broad being supported by rods '12 and 13, respec idea is limited to the exact construction herea 1n shQAYn.

'fcylindrical-shaped weights 10 and 11 off equal length and diameter. said weights tively, that are pivotally connected to the ,100

beam QHtequal distances 'from the fixed fulcrum of said beam. The weight 10. is

arranged the compartment A on one side of the orifice 3 and the weight ll isa r ranged in'the compartmentrB on the dpposite side of said orifice, said weights bein the loiver ends-of both weights will be 'ap orifice '3 when the'beam 8 is in perfect bsurface even when they are completely submerged. -I prefer to arrange said weights inside of tubular-shapedprotecting members 14 having openings 15 at their lower 15 endsthatpermit the water'in the conduit to, flow into sani'efand th-us rise;to-the same height around the weights as the water on a the outside of said protecting members, the function of theseprotecting members M 20. beingmerely to prevent the flowing water in the conduit from exerting a lateral pres- I sure on the weights or cylinderslO and 11 @or from surging around said weights and thusthrowing them out of-a true vertical position-b? causing them to oscillate more rapidlythan does the mean level of the water around them.'

- I A weight l6whichpreferably consists of a closed cylinder weighted in excess of its. dis-.

placement, is connected to one end of the beam 8, "and said weight is arranged inside-of a tank 17 to which water issupplied, ashereina'fter described.- This weight '16 is approximately one-half the length and area of the weights 10 and 11 but it is suspended from'the beam 8 at twice the lever distance from the fulcrum of said beam as the Weights 10 and 11. Consequently, a one-' pound pull on weight 16 will balance a two- 40 pound pull-on weight 10 and-will be equal to a two-pound pull on weightll. a I The cylinders or weights 1( 11 "and; 16

are connected to the beam 8 in such a mannerthat they will be in balance 'o'nlywhen '45' certain conditions are established namely,,

when the water on both sidesfof: the orifice 3 is at the same level and the water-in the tank 17 is at a certain level; fore'Xample,

the level indicated by the dot-and-dash lines w and 7 in Fig. 1. If the level l-of the water around the cylinder 10 varies, the sustaining force which said waterexerts on said a cylinder will," of course, ,chang'e aand thus For cX- ample, if the flow of water'intothe conduit throw the beanr 8 outof balance.

(increases, the water in the compartment A ,w1ll r1se to a hlgher level than the water in the compartment B because the water has, to pass through an orifice 3 of less diameter};-

=.tl 1 a n the conduit, in passing from'the com I'p'artment A into the compartment B, the partition -2 in the conduit forming practica-lly a dam that holds back or impedes the I flowof water. This difference in the level 35 of the water on the two sides ofvthe orifice 53 will throw the beam 8 out of balance -for the weight 11 will exert a greater downward. pull on the beam than the weight 10 does.

whenever the'level of the water around the weight 1'1;is lower than the level of vthe wateraround the weight 10.' It is immaterial, so far as the'successful operation of my apparatus is concerned, whether-the normal level of the water is at the lower ends of the weights 10 and 11 or at the middle or top of said weights, for so long 'as the level on both sides of the orifice 3' is equal," I

the water will not flow-through said ori-' lice and the beam andf, weights will remain in perfect balance. As soon as the water starts to flow through the orifice, however, I

the level ol gthe water in the compartment A w ll rise and thus causethe weight 11 to descend and the weight 10 to move. up,

' of said beam and weights,.iand, in the em' bodnnent of my invention herein shown,

said forceconsists of a hydraulic medium that is admitted to or conducted away from the tank 17 by means of apipe 18,'"said hy- 'draulic medium being controlled or set inmotion bymeans of a. balanced pilot'valve D. It will,.fo=f course, be obvious, however,"

that any other suitable device could be sub- 1 stitutedfor thebalanced pilot valve D, and

in other embodiments :of my; invention wherein a pneumatic oran electrical medi um is employed for restoring the equip of the system, a suitable device for same,

' suclnfor example, as a pneumatic valve or a an electric switch or contacts,- will be subjstituted forthe valve- D. herein shown, "The piston 19 of the valve D herein'shown as being secured" to the rod 12*which formsthe connection between the-weight 10. and; the beam Sbut it will, of course, be obvious that a separate connection between said piston andthebeam 'or one of the weights'could be of my invention, a

The casing or cylinder inside of which the employed without departing from thespirit "piston 19,01 the valve Dis reciprocatinglyi mounted, is provided at its upperfand' lower ends-with waste-pipes-QOand-21. lThe pipe 18 that leads from the-lower end of thetank 17 is tapped into the casing of the pilot valve Dadjacent the upper end thereof, and apressure linel22is tapped into the casing of-said valve' at approximately the center thereof, jasshown in Fig. 3, the piston 19 being" so arranged that the pipe 18 is balance; The upward movement of the weight 10, caused] by the rising of the water around said' weight, imparts an, upward movement to the piston 19 of the pilot valve closed when the weights and beam '8 are in D:and tliusL opens the pipe 18 so that the wat'er"jrornfjtheipressure line 22 can flow t oiigh said pipeinto thetank l7 inside of around i same;

thewightflfi is-arranged. The water levelfaround} the weight: 1'6- is f as much above the normaljlevellif difcated, by the dotand- I clashflines as and'iyas the level 'o fthe water about the weight-'11 lower than the level 1"about jthelweight l: 1 In other words, the pilm Vall jDTprmltS enough water to flow into thetank to exert sutlicie'nt additional reSSln'eWon the weight 16 to I tel upward' pressure that was eii'er ed on the weight by the water rising The introduction of the Water fro nfthe pressure'rline 22 into the tank l7"thusauesithe qbeain 8"to return to its normal I-balanced position, and as said beam oves "back" to'its normal position the piston ofwater' from ftlielflpress ure line into the to I conduit be diminished the level and [thus I ca use thfiwei gh t 10 to descend.

p v ltl ofthe pi'lot 'valve'D to qv'eidownwardl butsaldpiston is so conaaeiaaan" does not permit the water i fromfthe 'pi'e uredine to flow into the pipe 18 when it infthis direction, the down ward movementofsaidspiston merelyopenzingthepipe' l8 sothat the water from the tank 17 feahyd'rainjouty through" said pipe into the cylinder of) the pilot valve and thence eseapenthroiigh thei waste-pipe 20 adjaentth i pper end of said valve cylinder. The'water-continues to drain out of the tank 17' until the water lei'el around the weight a 16has'droppedonfallentoa-point only as mnchabove tli'e inonnal level indicated by the dot and-dashlines m and y as the difi'erenee hetween'the level around the weight Q10 andthetlevel around 'weight ll. That is I i to say, if thedifierenee of level around 10 vandll'ldecreases,the equilibrium of beam 8 will he destroyed fand't he pistonof" pilot D3 will heinovedjjdownnvardly and in an drain savor same, I'Ih'dmining f'itlie Sto 'reSume -its baIance and close the pilot valve D so as to prevent further draining of tank ll' The level in tank-17 will then stand as inuehiabove the dot-and-dash line i as the levelarouild 10 is-higherthan I the'l evel aroundll; Ifdesiredflhe mechanismffor actuating gate of thelhydraue 1e *valve Cwtllat controls the flow of the semi-sues ft olfljow intojthis tank 17 until the l ofjthe pilot valve; moves back [to its nor nal' position, "therebyjcutting off the flow ornpartinent: A. will drop' he downward movement of thi'sLweight 1-0" ajnlel7 diminishesjthe sustaining force on ,tthe weight It}, thereby causing said weight 1=to move downwardlygradually as the level around-it lfalls, and thus causing the beam chemical solution through the pipe 4c, could be operated by the beam ,8 so as th cause the supply of chemical solution to vary as the quantity of water supplied to the compartnient B varies, but in the form. described,

for reasons to be hereinafter stated, I use a separate set of weights and 24: and a beam 25 for operating the pistonfof a balarea that are weighted in excess of their displacement so that 'they will act as weights even when they are completely submerged. The weight 23 is arranged inside of a tank 27, and the weight 24 arranged inside of the tank 5 which receives the chemical solution from the supply ,pipe4,

the tank 27 being in communication with the tank 17 by means of apipe28 so that water can'enter the tank 27 and assume the same level as the water inthe tank 1?.

The weights 23 and 24 are so arranged that 5 i they will bein balance onlv when the level 1- y of the water around weight 23 is the sa-ine' as the level of the chemical solution around weight 24. the leastchange in'level ariound "said weights causing the beam 25 to move and thus vary the position of the piston of the pilot valve E. The gate'of the hy draulic val e C is so arranged that when the beam 25 is in balance the quantity of chemical solution that leaves the tank 5 through the orifice 6 will be just the same as the qu'antitv of chemical solution that enters said tank through the pipe 4. The balanced pilot valve E is .,of'substantially the same construction as the pilot valve D previously described, and the piston 29 of said valve is secured to arod 30 thatis piv otally connected to one end of the beam 25. A. pressure line 31 leads to the center of the cylinder or casing of the valve E and i es 32 and 33 lead from said valve cylinder tothe cvlinder of the hydraulic valve C, the cylinder of thepilot valve E being provided with wasteepipes 34 and 35 that lead from thefuppenand lower ends thereof. respectively. t

Whenever the level of the Water around the weight 23- drops the beam 25 will move in a direction to impart an upward move-. 'ment to the piston 29 of the balanced valve t E and thus permit the water in thepressure line 31 to'flow through the pipe 32 into the cylinder of the hydraulic valve C and thus. partially close the gate. of said valve so asto'restrict the flow. of the chemicalsolution through the pipe 4 into the tank 5. The partial closing Ofthehys tolfreceiye a number of ,weights, each of I draulic valve C of course reduces the sup- -ply of chemical solutionpto "the tank 5," and when the level of the solution around the weight 24 has dropped; to the.level of the water around the weight 23 the beam '25 will return to its balanced position and in doingso' will move the pistonof thepilot valve .E backqto' its normal position, the gate of the hydraulic valveremaining in the position towhich it has, been moved so as to, restrict the How through the pipe 4:

sufficiently to keep thelevel around the weight 24: atthe same level as the .level around the weight 23; Ifthe level around the weight 23 should rise, as for example,

'during'the time when the water is being admitted from the pressujreli'ne 22 into the a tank 17 to restore the beams to its normal balanced position, the beam. which carries'the weights 23 and E24,:will be thrown out of balance and thus move the piston of the pilot-valve E downwardly so that the water fromthe pressure line 31 can flow through: the vpipe 33 into the cylinder of the gate valve C and thus move the gate thereof in'a direction-to permit .a greater quantity. of chemical solution to ,;flow into eoi fipf-eourse cutting off the flow of the wetheta'nk 5 and thus restore the balance of the beam 2-5, the pistongof' thepilot valve terfthi o'ugh the pipe 33j-when the equilibrium' off"th e beam 25 is againestablished.

As the I level of; the water around'jthe weights 16and231must always be the same, and as the level around weightlti isalw-ays; equal'to'the diiference of level around the 1 WeightS 'lO and 11, it necessarily follows that thehead of liquid-*over'the orificeGin 40'; t'er over the main orifice. 3 in the water the chemical solution tank; 5'will always proportionately with thehead of'wac'onduit." Consequently, the flow 'of-'- the a chemical solution through the orifice 6 will always. be -proportionate, within :certain limits, with the fiow of water from the compartment A into the compartment B.

"\ Vhile I have herein Eshown only one weight23 in the tank27 for controlling a single beam 25, it will. of course, be obvious that said tank could be made large enough In this way any desirednum head, level or pressure as said second head,

- level orpressure varies by means of freely.

movable mechanism adapted to transmit and" oppose forces proportional to the pressures acting upon it, and opposed to one. another through it for its required range of; motion. 2.1The method of controlling the flow. of j a substance which consists in creating a plurahty of flu d pressures, heads or levels against a fixed point andof varylngone of and functionally 'as the resultant of said other heads, levels or p'ressures by means of freely movable mechanism exertingt constant forces constant pressures throughout'its' range of" motion.

said heads,.levelsor pressures automatically 3. The methodfof'controlli'n new which consists of providing a uid pressure. agamst Ia fixed polnt "and automatically maintaining the same functional to another fluid pressure which is varying by means of freelv movable mechanism exertingconstant forces at constant p1-essures.throughout range of motion. a

4. The method of controlling a; fluid flow which consists in providing-a fluid pressure against [a fixed point. and". automatically maintaining it functional to the difference between two other fluid pressures, one of; I

which isvarying by means 'offreely movable mechanism exerting constant forces atconst'a'nt pressures throug'houtjits range'of; mo-

' 5. The method ofcont'rolliirg' a fluid flow which ,consistsji n .providinga fluid -;pressure against'a fixed point and automatically maintaining it functional .tov the difference be'tween two other fluid pressures bothof which are varying by means, of freely movable mechanism exerting constant forces at constant pressures" throughout its range of motion,

G. The method 'of controllinga fluid flow,

whichconsists of producing 'afluid pressure diflerence'against'a fixed point'and maintaining it functional toavarying fluidcprese" sure by means of freely movable mechanism exerting constantforces at constant pres'-- sures throughout itsa'ange of motion. 7. The method of controlling a fluid flow which'gconsists' of providinga fluid pressure difference against a' fixedrpointfandautomatica'l-ly maintaining itfunctional to the resultant of a plurality of other pressure differences, one of which] is varia'ble' by means of freely movable. mechanism exert-' ing constant .forces at constant pressures throughout its range of motion;

8, The method of controlling a fluid flowwhich consists ofpri 'q idingi a fluid pressure difference against a need point, and automati'cally maintaining it functional to the resultant of a plurality of,other!v pressure differences, all of which are variable by means offreely movable mechan sm exert v balanced position.

'constant forces at constant pressures ghout its range of motion. v cil'ifi'ifhe niethod of'creating a flow in a closed conduit under pressure fun'ctional to a p s'sure. or, pressure difference which is arying through the operation of a normally balanced ibratile member reciprocating through a very smal'ldistance and utilizing said flow to. maintain said member in normal 10. Themetliod of creating a flow in: a

' closed conduit under pressure functional to 7 a'lpressure of'pressure varylng-throughtlie operation of a balanced member adapted to ,small distances, creating a difference which is vibratileh me'mber reciprocating 'through a very small distance and utilizing saidfiow to maintain said member in normal balanced position. q c a a lL'The 'method of actuating apparatus hydraulically by creating-a pressure in a .oonduit lprotiding a vibratile balanced reciprocate through functional flow I through the operation. of said member a through a small balance, through such ,functional flow in a closed conduit under to maintain said member in fratus by said flow and such functional flow and operating said appautilizing said flow to maintainsaid member in normal balanced position. a I

1:2. The method of operating apparatus hydraulically which consists in providing a balanced vibratile member reciprocating distance to maintain its membercreating a through such distances,

pressure, controlling such apparatus through utilizing said'fiow normal, balanced position. g

13.Themethod of controlling apparatus hydraulically which consists in providing a normally balanced member capable of being vibrated on excursions of small amplitude and 'of creating a maintain said "'acted upon by said pressures and maintained in equilibrium.

15. The method of um automatically, :yidingi'a varying governing-fluid pre ure functional flow through the Roperation of said member in such amplitildes; which fiow' operates said-apparatus hydraulically and utilizing said 4H0: to;

position. a

"14. The method or regulating fluid a e a sure automatically, which consists in creat ing a varying governing fluid pressure,, cre "j ating an independent fluid pressure, pro riding means thIOlIghfiVhlCh said lndepend ent pressure is governed and regulated d termined functional relation" to said firstnamed-fluid pressurea said meansincluding a balancing vibratile member regulating fluid jfire jai which consists in -1pm;

independent d fi iicel ram-i s e i a, through in m ndin de nd le su s member in normal balanced regulated in any predetermined functional relation to said fluid pressure difference, said means includinga balanced vibratile member acted upon by 1 said pressure and pressure difference and maintained in' equilibrlum. I

and through yibra'tory means automatically I causing changes in pressure in one of said receptacles functionally to the changes in pressure in the other of said receptacles, said vibratory means being freely movable and exerting constant forces at constant pressures throughout the range of motion thereot. w

18. The method of maintaining any predetermined functional relation between a plurality of static fluid. pressures measured from a fluid pressure to a plurality of fluid pressure cells, which consists in providing such cells and in sub'ecting one or more of said cells the resultant of fixed and common datum plane, and communicated from one or more sources or'v to independently varying static fluid pres- I sures and in. providing a i'ibratile member adapted to be acted upon by the fluid pres:

sure in all of said cells, and to be affected in its action, thereon In a definitefiamount, and direction by each changed. condition of pressure in each of said respective static fluid pressure c ells, and in equilibrium only when said predetermined functional -i"elationsexist,and in providing sources of fluid pressure of adequate high and low pressure. range,

fl said fluid pressure cells and providing means including a valve operated by said stroyed to cause" compensating changes of Zpressu re i'restore'pet-he "equilibrium of said vibratile meinberf 19, Thefmethod of maintaining a fluid pressure in one fluid pressure cell equal to g another independently varying fluid pres sure another fluid pressure cell, both pres jag r'ibratile member acted connected with one or more "ibratile rneinberivhen its equilibrium isde-.,

in the lasjt named cell's, andthereby i mon datum fp'lan'e, xvhich consists in provldp, pressure cells andasource ,of pressurereonnected to one of said cells, creat hereiniamindependently varying static .Wayv from said source to, said outlet and a con- Q "upon oppositely by the pressures in said cells, .and of providing a higher source of flu1d pressure and an'outletfor fluid flow of lower pressure than said independently varying static fluidpressure, with a fluid passage- 3 fleetioriff-rom said passageway between said source and said ,outlet,"to the. other of said fluid pressurefcells in which the pressure is.

to be governed, and priv-iding means includmg 'a valve operated-by saidvibratile meme her to regulate the quantity of fluid in said 1 governed pressure cell.

20. The method of controlling apparatus hydraulically, which consists in creating 'a plurality of fluid pressures against a fixed point and by meansof freely movable mechanism exerting constantyforces at constant pressures throughout the necessary range of motion thereof, and of varymg'one of said pressures automatically and functionally as A the resultant of the cth'erof said pressures variesr 21.. The method of automatically regulating one or more static fluid pressures in any predetermined functlonal relation with one or more other independently varying static fluid pressures, all of said pressures;

beingmeasured from a fixed, and common datum plane, which consists in providing a plurality of fluid pressure chambers," each adaptedto receive =fluctuating static fluidpressures, and of connecting said independently-varyingv pressures each to one of said pressure chambers, and in provldmg a vi bratile member adapted. to move through a small but flniterange of motion and a plurality ,of weights attached to'such vibratile member-and adapted to exert a thrust due .to their Weights upon said member tending to cause said member to move within said range of motion, said Weights being alfected in the amount of said thrust I respectively by the. fluctuating fluid levels in said static fluid pressure chambers, and.

in providing a source of fluid pressure and I an outlet for fluid flow of ade quate high M chambers, and a valve in said passage-way to govern the flow of fluid theretlu'ougli'op- I and low pressure range and a passage-way from. said source to said outlet with connection between said sourcean'd said outlet to one ormo'r'e other of said'fluid pressure erated by said vibratile member.

.22. The method of maintaining the static fluid pressure in one fluid pressure cell in any predetermined functional relation .to an independently varying static fluid pressure inanother fluid pressure cell, both of land coinmon ldatum plane, which consists 1n provldmg such cells and such 1ndepend-' said pressures being measured from a fixed entlv varying fluid pressure. connected to one of sald', cells; and a movable member acted upon by the pressure n said cells,-

and in providing a source of fluid'pressure and an outlet for fluid flow'of adequate high} and low' pressl'lre range, and a fluid passage 1 nected between said source and said outlet way from said source to said outlet con '70 with the other of said cells, and providing'a valve in such passage-way operated bysaid movable member to govern the flow of fluid thrQugh said passage-Way. v

23.. The method of maintaining the static fluid; pressure in one fluid pressurecell in any predetermined functional relation to an independently varying static fluid pressure in another fluid pressure cell, both.o.f said pressures being measured from'a fixed and common datum plane, which consists in providingsuch cells "and such independently varying fluid ressure'connected to-one of said cells, an a vibratile member acted fupon by two" weights connected therewith, 1 said Weights being *adapted to'transmit yaryingthrust's tousald vibratil'e member- -de-.

pending respectively jupon the. fluid levels existing in "said static fluid, pressure cells,

and 1n providing a source of fluid pressure high 'and low pressure range, and a fluid passageway-"from said source'to said outlet.

connected between said source and saidout-Q let-with the'gother of said cells, and providing means operated'hv themovahle member .to goveru'thefloW of fiu1d"1n. sa1d passageway. 1

'24. The method of' controllingwafluid pressure orpressure difference so that it shall varyfunctionallywith another pressure .or pressureidiiference, which consists in governing the flovt of fluid supply which creates the said fluidpressure orpressure difference by the. action ,of a movable mem her which is acted upon by said first named pressure orjpressure 'difi'erenceand lay-said; ,varying ressure; or" pressure difference. and:

which member is inequilibrium; only when the desiredfunctional relationsexist be- 25} The method-"ofcreatinga fluid pressure m'a pressure chamber 1nafixed posil-c si;

tion, which shall vary functionally with varlations" occurring in another fluid pressure chamber in a fixed position, which consists iii-causing the'firstnamed pressure and the second named pressure to act upon a movable. member which movable member is in equilibrium when'theirequired func-" tional relations exist and acts: whenever its equil brium is destroyedibymny change in the second named .fluidpressure to bring about a corresponding changein the first named fluid pressure thereby restoring the; I

required functional -relation"between l the sald'first named and the/said sgcond named 11o tween the said first named fluid. pressure, V or pressure dlfl'erence and the saidvarying pressure or pressure difference.

l 26. The method of creating a' fluid pressure which shall vary functionally with variations occurring in a pressure difference, cons sts in causlng the'first named pressure andthe pressure'd tference to act upona. n ovable member, movable member is in equillbrium when the requiredfunctional-relationsexist, and acts when its :1:equilibrlumis destroyed by;.any change in mzthe pressure" diiference to cause a correspondingchange in the first'named pressure thereby restoring the; required functional relation between the first named pressure and the pressure difference.-

- "27. The method of creating a pressure difj "ference which shall vary functionally with variations occurring in a fluid pressure,

which consists in causing the said pressure difference and the last named pressure to act upon a movable member. which movable member is in equilibrium" when the required functional relation existsland acts whenever its equilibrium is destroyed by any change in the lastnamed pressure to bring abouta corresponding change in the fluid pressure a difference, thereby restoring the required i functional relation between the pressure difference and the last named fluid pressure.

l 28. Themethod of creatingapressure dif- 3Q ference which shall-vary functionally with variations occurring uin a second fluid pressurediiference, which consists in causing the first -named'pressure difference and the second named pressure difference to act upon a movable meinbenwhich member is in equi- 1, lib'rium when the required functional rela- I, tlions, exist andfacts whenever its-equilibrium i is destroyed by" anychangei in the second named fluid; pressure diiference to bring tp-abouts corresponding change in the first namedfluid pressure difference, thereby restoring the required functional relation benamed fluid pressure differences i The method of causing the, fluid pressureover fixed datum to vary functionally "with variations occurring-1n another varying fluiclpre'ssure which consists incausing both of saidpressures to at'uponra-movable K memb'erywhich movable niember is'iinequi libriumwhen the required functional relations between said two pressures exists and when its equilibrium is destroyed by any change in the second named pressure will 5 ]move and thereby modify said first named pre'lss'ure to the required functional relation and xthe'reby restore the equilibrium of said movable. member.v V

' 30. Thezmethod ofcreati-ng automatically 760'. any? ,Iiequired functional relation {between a plurality-of fluidv pressures actingat fixed,

points, one or more of wliich' pressures .is

Q freely varying, which consists in applying 7 said-"pressures toa fiiOYablQIQBIPbeL WlHCh -L Qmovableunemben and at said movable member sojthat the effective ing a pluralityof fluid pressures, one or rest when the required functional relation exists and whenever such functional relation is destroyed moves to a new position of equilibriuman'dj thereby acts upon one or more of said pressures .to-restore said required functional relations.

BL The method of creating any'i'equ'ired functional relation between fluid pressures which constitute. pressuredifierences efl'ecting' the discharge of fluidslthrough two dif- 15 ferent discharging members in fixed posi- 'tions, wl1ichc0nsists' in applying all of said pressures to movable member, which movable member is at rest and in equilibrium when the required functional relation exists and whenever its equilibrium is destroyed moves to a new position of'e'quilibrium and 'thereby restores the required. functional relations. i

32.-The employment of amov'ableme'm- :5

her acted upon by one or more fluid presssures, whose effective sum .is varying govern the effective sum of one or more,

other fluid pressures which/also act upon 1 sum of said secondnamed'fluid pressures is automatically maintained at apredeter-f mined function of the infective sum of said first named fluid pressures, all of said fluid pressures being referred to and measured from a common datum plane at a constant elevatio r 33. .The method o f'regulating fluid pres sure automatically, Which'consists in utilizmore of which is varying, utilizing an inde-' pendent fluid pressure, providing means throughwhich. said independent pressure is governed Y and regulated in any p'redeter- I mined functional'relatioii to the algebraic sum ofthe'other -fluid pressures, said means 7 said means including a'balanced vibratile- I member acted upon by said pressure difi'erence and said pressure and'maintained in equilibrium. Y

35. The method of regulating fluid pres- 7 sure automatically, which consists in utiliz'' ing a varying governing fluid pressure difference, utilizing an independentfluid pressure .diiterence and providing means through i which said independent pressure difference is governed and regulatedi-n any predeteri mined functional relation to said first named pressure difierenoe, said means including a 15..

said fluid pressl redifierenees and 'mainta 'nedfm equilibrium.

balanced vibratile member acted rup 36. Theiriethod of sure automaticall which consists in utilizing a'- plurality o governing fiuid pressii'res;

one or more of which are varying, utilizing ,an' independent fluidpres sure difi'eren'ce and, providing means through which said inde 10 pendent pressure difference is govei' ned and re latjed in'ilny predetermined functional to he Varying algebrai e sum of said regulating fluid pres -plurality of other fluid pressures,- sai d last member acted upon by saidfluid pressure sures and maintained inequilibrinm.

"In testimony whereof, .I- affix my signature in the presence "of two Witnesses.

- "Witnesses: 4

EDWARD A. FOWLER, J OHN C. BA TLEY.-

named means including a balanced Vibratile I l 5 I difference and said plurality of fluid pre s- I GEORGE GOODVELL EARL. I 

